common/env_common.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <environment.h>
  30 #include <linux/stddef.h>
  31 #include <malloc.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 #ifdef CONFIG_AMIGAONEG3SE
  36         extern void enable_nvram(void);
  37         extern void disable_nvram(void);
  38 #endif
  39
  40 #undef DEBUG_ENV
  41 #ifdef DEBUG_ENV
  42 #define DEBUGF(fmt,args...) printf(fmt ,##args)
  43 #else
  44 #define DEBUGF(fmt,args...)
  45 #endif
  46
  47 extern env_t *env_ptr;
  48
  49 extern void env_relocate_spec (void);
  50 extern uchar env_get_char_spec(int);
  51
  52 static uchar env_get_char_init (int index);
  53 uchar (*env_get_char)(int) = env_get_char_init;
  54
  55 /************************************************************************
  56  * Default settings to be used when no valid environment is found
  57  */
  58 #define XMK_STR(x)      #x
  59 #define MK_STR(x)       XMK_STR(x)
  60
  61 uchar default_environment[] = {
  62 #ifdef  CONFIG_BOOTARGS
  63         "bootargs="     CONFIG_BOOTARGS                 "\0"
  64 #endif
  65 #ifdef  CONFIG_BOOTCOMMAND
  66         "bootcmd="      CONFIG_BOOTCOMMAND              "\0"
  67 #endif
  68 #ifdef  CONFIG_RAMBOOTCOMMAND
  69         "ramboot="      CONFIG_RAMBOOTCOMMAND           "\0"
  70 #endif
  71 #ifdef  CONFIG_NFSBOOTCOMMAND
  72         "nfsboot="      CONFIG_NFSBOOTCOMMAND           "\0"
  73 #endif
  74 #if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
  75         "bootdelay="    MK_STR(CONFIG_BOOTDELAY)        "\0"
  76 #endif
  77 #if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
  78         "baudrate="     MK_STR(CONFIG_BAUDRATE)         "\0"
  79 #endif
  80 #ifdef  CONFIG_LOADS_ECHO
  81         "loads_echo="   MK_STR(CONFIG_LOADS_ECHO)       "\0"
  82 #endif
  83 #ifdef  CONFIG_ETHADDR
  84         "ethaddr="      MK_STR(CONFIG_ETHADDR)          "\0"
  85 #endif
  86 #ifdef  CONFIG_ETH1ADDR
  87         "eth1addr="     MK_STR(CONFIG_ETH1ADDR)         "\0"
  88 #endif
  89 #ifdef  CONFIG_ETH2ADDR
  90         "eth2addr="     MK_STR(CONFIG_ETH2ADDR)         "\0"
  91 #endif
  92 #ifdef  CONFIG_ETH3ADDR
  93         "eth3addr="     MK_STR(CONFIG_ETH3ADDR)         "\0"
  94 #endif
  95 #ifdef  CONFIG_IPADDR
  96         "ipaddr="       MK_STR(CONFIG_IPADDR)           "\0"
  97 #endif
  98 #ifdef  CONFIG_SERVERIP
  99         "serverip="     MK_STR(CONFIG_SERVERIP)         "\0"
 100 #endif
 101 #ifdef  CFG_AUTOLOAD
 102         "autoload="     CFG_AUTOLOAD                    "\0"
 103 #endif
 104 #ifdef  CONFIG_PREBOOT
 105         "preboot="      CONFIG_PREBOOT                  "\0"
 106 #endif
 107 #ifdef  CONFIG_ROOTPATH
 108         "rootpath="     MK_STR(CONFIG_ROOTPATH)         "\0"
 109 #endif
 110 #ifdef  CONFIG_GATEWAYIP
 111         "gatewayip="    MK_STR(CONFIG_GATEWAYIP)        "\0"
 112 #endif
 113 #ifdef  CONFIG_NETMASK
 114         "netmask="      MK_STR(CONFIG_NETMASK)          "\0"
 115 #endif
 116 #ifdef  CONFIG_HOSTNAME
 117         "hostname="     MK_STR(CONFIG_HOSTNAME)         "\0"
 118 #endif
 119 #ifdef  CONFIG_BOOTFILE
 120         "bootfile="     MK_STR(CONFIG_BOOTFILE)         "\0"
 121 #endif
 122 #ifdef  CONFIG_LOADADDR
 123         "loadaddr="     MK_STR(CONFIG_LOADADDR)         "\0"
 124 #endif
 125 #ifdef  CONFIG_CLOCKS_IN_MHZ
 126         "clocks_in_mhz=1\0"
 127 #endif
 128 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
 129         "pcidelay="     MK_STR(CONFIG_PCI_BOOTDELAY)    "\0"
 130 #endif
 131 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 132         CONFIG_EXTRA_ENV_SETTINGS
 133 #endif
 134         "\0"
 135 };
 136
 137 #if defined(CFG_ENV_IS_IN_NAND)         /* Environment is in Nand Flash */
 138 int default_environment_size = sizeof(default_environment);
 139 #endif
 140
 141 void env_crc_update (void)
 142 {
 143         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 144 }
 145
 146 static uchar env_get_char_init (int index)
 147 {
 148         uchar c;
 149
 150         /* if crc was bad, use the default environment */
 151         if (gd->env_valid)
 152         {
 153                 c = env_get_char_spec(index);
 154         } else {
 155                 c = default_environment[index];
 156         }
 157
 158         return (c);
 159 }
 160
 161 #ifdef CONFIG_AMIGAONEG3SE
 162 uchar env_get_char_memory (int index)
 163 {
 164         uchar retval;
 165         enable_nvram();
 166         if (gd->env_valid) {
 167                 retval = ( *((uchar *)(gd->env_addr + index)) );
 168         } else {
 169                 retval = ( default_environment[index] );
 170         }
 171         disable_nvram();
 172         return retval;
 173 }
 174 #else
 175 uchar env_get_char_memory (int index)
 176 {
 177         if (gd->env_valid) {
 178                 return ( *((uchar *)(gd->env_addr + index)) );
 179         } else {
 180                 return ( default_environment[index] );
 181         }
 182 }
 183 #endif
 184
 185 uchar *env_get_addr (int index)
 186 {
 187         if (gd->env_valid) {
 188                 return ( ((uchar *)(gd->env_addr + index)) );
 189         } else {
 190                 return (&default_environment[index]);
 191         }
 192 }
 193
 194 void env_relocate (void)
 195 {
 196         DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
 197                 gd->reloc_off);
 198
 199 #ifdef CONFIG_AMIGAONEG3SE
 200         enable_nvram();
 201 #endif
 202
 203 #ifdef ENV_IS_EMBEDDED
 204         /*
 205          * The environment buffer is embedded with the text segment,
 206          * just relocate the environment pointer
 207          */
 208         env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
 209         DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 210 #else
 211         /*
 212          * We must allocate a buffer for the environment
 213          */
 214         env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
 215         DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 216 #endif
 217
 218         /*
 219          * After relocation to RAM, we can always use the "memory" functions
 220          */
 221         env_get_char = env_get_char_memory;
 222
 223         if (gd->env_valid == 0) {
 224 #if defined(CONFIG_GTH) || defined(CFG_ENV_IS_NOWHERE)  /* Environment not changable */
 225                 puts ("Using default environment\n\n");
 226 #else
 227                 puts ("*** Warning - bad CRC, using default environment\n\n");
 228                 show_boot_progress (-60);
 229 #endif
 230
 231                 if (sizeof(default_environment) > ENV_SIZE)
 232                 {
 233                         puts ("*** Error - default environment is too large\n\n");
 234                         return;
 235                 }
 236
 237                 memset (env_ptr, 0, sizeof(env_t));
 238                 memcpy (env_ptr->data,
 239                         default_environment,
 240                         sizeof(default_environment));
 241 #ifdef CFG_REDUNDAND_ENVIRONMENT
 242                 env_ptr->flags = 0xFF;
 243 #endif
 244                 env_crc_update ();
 245                 gd->env_valid = 1;
 246         }
 247         else {
 248                 env_relocate_spec ();
 249         }
 250         gd->env_addr = (ulong)&(env_ptr->data);
 251
 252 #ifdef CONFIG_AMIGAONEG3SE
 253         disable_nvram();
 254 #endif
 255 }
 256
 257 #ifdef CONFIG_AUTO_COMPLETE
 258 int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
 259 {
 260         int i, nxt, len, vallen, found;
 261         const char *lval, *rval;
 262
 263         found = 0;
 264         cmdv[0] = NULL;
 265
 266         len = strlen(var);
 267         /* now iterate over the variables and select those that match */
 268         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 269
 270                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt)
 271                         ;
 272
 273                 lval = (char *)env_get_addr(i);
 274                 rval = strchr(lval, '=');
 275                 if (rval != NULL) {
 276                         vallen = rval - lval;
 277                         rval++;
 278                 } else
 279                         vallen = strlen(lval);
 280
 281                 if (len > 0 && (vallen < len || memcmp(lval, var, len) != 0))
 282                         continue;
 283
 284                 if (found >= maxv - 2 || bufsz < vallen + 1) {
 285                         cmdv[found++] = "...";
 286                         break;
 287                 }
 288                 cmdv[found++] = buf;
 289                 memcpy(buf, lval, vallen); buf += vallen; bufsz -= vallen;
 290                 *buf++ = '\0'; bufsz--;
 291         }
 292
 293         cmdv[found] = NULL;
 294         return found;
 295 }
 296 #endif